Tub



FIG. 1 is a perspective view taken from the top, front, and right side of a tub for bathing showing my new design;

FIG. 2 is a top plan view of a bathtub showing my new design;

FIG. 3 is a side view thereof, the opposite side being identical thereto; and,

FIG. 4 is a back view thereof.

Shading and broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a tub, as shown and described. 